CN112014219B - GH4169 alloy casing forging acceptance method based on deformation degree control - Google Patents
GH4169 alloy casing forging acceptance method based on deformation degree control Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 212
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- 229910001069 Ti alloy Inorganic materials 0.000 description 3
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- 101000912561 Bos taurus Fibrinogen gamma-B chain Proteins 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
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- 239000000463 material Substances 0.000 description 1
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Abstract
A method for checking and accepting a GH4169 alloy case forging based on deformation degree control belongs to the field of forging manufacturing detection. The method determines the technical indexes of grain size and Brinell hardness suitable for the GH4169 alloy case, determines the control indexes of grain size and fluctuation difference value of different positions of the same GH4169 alloy case forged piece, and the control indexes of Brinell hardness fluctuation difference value of different positions of the same GH4169 alloy case forged piece and different GH4169 alloy case forged pieces in the same batch, and cuts and accepts the GH4169 low-pressure case forged piece after samples are obtained. The quality condition of the GH4169 alloy case forged piece is obtained through the deformation degree of the GH4169 alloy case part, the metallurgical quality acceptance index of the GH4169 alloy case forged piece is provided, the GH4169 alloy case forged piece with uniform tissue, mechanical property and residual stress distribution is obtained, and the requirements of size precision and deformation degree in the part machining process are met.
Description
Technical Field
The invention belongs to the technical field of forging manufacturing detection, and particularly relates to a GH4169 alloy casing forging acceptance method based on deformation degree control.
Background
The aircraft engine is the "heart" of the aircraft, while the casing is an important part of the aircraft engine supporting the rotor and the stator, a part operating in high altitude environments, which is required to meet the requirements of static and fatigue strength, and must have sufficient stability. The GH4169 alloy is a nickel-based high-temperature alloy which is precipitation-strengthened by a body-centered tetragonal gamma 'phase and a face-centered cubic gamma' phase, has good comprehensive performance at the temperature of-253 ℃ to 700 ℃, and can be used as an aviation case material.
The GH4169 alloy is widely applied to aeroengines, has the characteristics of high alloying degree, high Brinell hardness and high temperature resistance compared with titanium alloy, has the characteristics of a low-pressure turbine and other hot end parts in a typical structure, has the characteristics of high temperature, large stress and the like in a use environment, and is generally used for air inlet, compressor and other low-temperature parts. In the aspect of forging metallurgical quality, compared with TC4 and other two-phase titanium alloys, GH4169 alloy is required to obtain mechanical properties with higher level and higher temperature (650 ℃); further, since the GH4169 alloy has an austenite structure, the structure control is different from the phase morphology control of the titanium alloy, and mainly includes control in terms of grain size grade and the like.
The GH4169 alloy case blank for the aeroengine is generally an annular forging, and the general technical indexes of the annular forging are generally adopted according to the metallurgical quality acceptance requirements of the annular forging. However, compared with a common annular structural member, the casing part has the characteristics of complex profile, thin wall, easy deformation and the like, and the GH4169 alloy casing forged piece which is accepted according to the general technical indexes has low uniformity degree of organization and mechanical properties and large fluctuation of metallurgical quality level among different batches, so that the GH4169 alloy casing blank is often exposed to the problem that the GH4169 alloy casing part is scrapped due to overlarge size deformation of the part caused by improper release of residual stress in the subsequent processing process, and the stability and the reliable service degree of the aero-engine can be seriously influenced.
At present, a GH4169 alloy casing is taken as a typical part, and the metallurgical quality acceptance of the GH4169 alloy casing meets the standard of a GH4169 alloy annular forging. The grain size requires unilateral control limit and is looser, the interval span required by Brinell hardness is very large, the sampling quantity and position are single, and the requirements of related technical indexes of uniformity control are lacked.
The metallurgical quality level statistics of the GH4169 alloy case forgings manufactured according to the acceptance criteria of the annular forgings are shown in Table 1.
TABLE 1 metallurgical quality level statistics for GH4169 alloy case forgings
As can be seen from table 1, the fluctuation range of the brinell hardness and the grain size level of the GH4169 alloy casing forging is large, the structure monitoring of different positions of the GH4169 alloy casing forging is lacked, the metallurgical quality uniformity and the stability are low, the residual internal stress level of the GH4169 alloy casing forging is high and is not uniformly distributed, and further, the deformation is too large or even out of tolerance in the part processing process, and the part quality level is unstable.
Disclosure of Invention
Aiming at the problem that the size deformation of parts is large due to large and uneven residual stress in the machining process of the GH4169 alloy case forged piece, on the basis of the general acceptance standard of the existing annular forged piece adopted by the GH4169 alloy case forged piece, the invention provides a method for controlling the acceptance of the GH4169 alloy case forged piece based on the deformation degree, the quality condition of the GH4169 alloy case forged piece is obtained through the deformation degree of the GH4169 alloy case part, the invention obtains the GH4169 alloy case forged piece with uniform tissue, mechanical property and residual stress distribution by providing the special metallurgical quality acceptance index of the GH4169 alloy case forged piece, and meets the requirements on size precision and deformation degree in the machining process of the parts.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for controlling acceptance of a GH4169 alloy case forged piece based on deformation degree, which comprises the following steps of controlling acceptance indexes of the GH4169 alloy case forged piece based on deformation degree:
(1) controlling the requirement of Brinell hardness fluctuation difference between different positions of the same GH4169 alloy casing forging and different GH4169 alloy casing forgings in the same batch;
the method specifically comprises the following steps:
1) the technical index requirements of Brinell hardness of different positions of the same GH4169 alloy casing forging are as follows: the Brinell hardness HB = 346-450, and the difference Delta HB of the Brinell hardness at different positions is less than or equal to 28;
2) the technical index requirements of the Brinell hardness of the body of the GH4169 alloy casing forged piece in the same batch are as follows: the Brinell hardness difference Delta HB between the GH4169 alloy casing forgings in the same batch is less than or equal to 42;
(2) controlling the grain size and volatility difference values of different positions of the same forge piece; the method specifically comprises the following steps:
the grain size technical index requirements of different positions of the same GH4169 alloy casing forging are as follows: the average grain size is 4-9 grades, more preferably 5-8 grades, and the grain size grade difference of different positions is less than or equal to 2 grades.
The standard of the grain size grade judgment basis is as follows: GB/T6394-2017 metal average grain size determination method.
The method for controlling the acceptance of the GH4169 alloy case forged piece based on the deformation degree further comprises the following steps of controlling the acceptance index of the GH4169 alloy case forged piece based on the deformation degree:
(1) the technical index requirements of tensile mechanical properties of samples of GH4169 alloy casing forgings in different typical regions at room temperature are as follows: tensile Strength σbNot less than 1275MPa, yield strength sigma0.21035MPa or more and elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
(2) the technical index requirements of the tensile mechanical property of samples of GH4169 alloy casing forgings in different typical regions at the high temperature of 650 ℃ are as follows: tensile Strength σbNot less than 1000MPa, yield strength sigma0.2Not less than 860MPa, elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
(3) the technical index requirements of the endurance mechanical properties of samples of the GH4169 alloy casing forging in different typical regions at the high temperature of 650 ℃ and under the loading stress of 690MPa are as follows: the duration tau of the high-temperature durable sample is more than or equal to 25h, and the elongation delta after fracture is more than or equal to 5%.
The method for controlling the acceptance of the GH4169 alloy case forged piece based on the deformation degree further comprises the following steps of controlling the acceptance index of the GH4169 alloy case forged piece based on the deformation degree:
the technical index requirements of the macrostructure of the GH4169 alloy casing forging are as follows: there should be no visible metallurgical defects.
The visual metallurgical defects comprise one or more of looseness, pinholes, cracks, shrinkage cavities, segregation, slag inclusion and inclusions.
The method for controlling the acceptance of the GH4169 alloy case forged piece based on the deformation degree further comprises the following steps of controlling the acceptance index of the GH4169 alloy case forged piece based on the deformation degree:
and the GH4169 alloy casing forging is subjected to microstructure detection according to the current professional technical standard.
The invention provides a method for controlling acceptance indexes of GH4169 alloy casing forgings based on deformation degree, which comprises the following steps:
step 1: tissue property sampling scheme
According to the shape characteristics of the GH4169 alloy case forging, cutting GH4169 alloy case forging samples at different typical areas for structure performance detection, and ensuring that the requirements of uniformity evaluation and detection sampling are met;
step 2: acceptance index of tissue performance
And controlling the acceptance index of the GH4169 alloy casing forging to accept based on the deformation degree, wherein each detection sample is required to meet the requirement of the acceptance index.
In the step 1, the specific sampling mode is as follows:
(1) dividing the cross section of the GH4169 alloy casing forging into a small end, a middle part and a large end along the height direction as typical areas; at least 2 samples are respectively taken in each typical region along the chord direction of the GH4169 alloy case forging piece and are used as room-temperature tensile mechanical property samples of the GH4169 alloy case forging piece;
at least 2 samples are respectively taken along the chord direction of the GH4169 alloy casing forge piece in each typical area to serve as high-temperature tensile mechanical property samples of the GH4169 alloy casing forge piece;
at least 2 samples are respectively taken along the chord direction of the GH4169 alloy casing forge piece in each typical area to serve as high-temperature durable mechanical property samples of the GH4169 alloy casing forge piece;
(2) taking at least 1 sample at the position, close to the inner diameter surface, of the small end surface of the cross section of the GH4169 alloy casing forging, wherein the sample is the small end inner diameter sample; taking at least 1 sample at the position of the small end face close to the outer diameter face as a small end outer diameter sample; taking at least 1 sample at the height of 1/4 from the small end face as a sample at the small end 1/4; taking at least 2 samples from the middle part as middle samples; taking at least 1 sample at the height 1/4 from the end face of the big end as a sample at the big end 1/4, and taking at least 1 sample at the position of the end face of the big end close to the inner diameter surface as a sample at the inner diameter of the big end; taking at least 1 sample at the position of the end face of the big end close to the outer diameter face as a big end outer diameter sample;
taking samples obtained twice respectively according to the sampling mode, wherein the samples obtained once are used as grain size samples of the GH4169 alloy casing forging; taking the other obtained sample as a sample with Brinell hardness at different positions of the GH4169 alloy casing forging; the detection surface is a radial shaft surface of the sample;
(3) at least 3 points which are uniformly distributed at intervals along the circumferential direction are respectively sampled on the end face, perpendicular to the middle shaft, of a plurality of GH4169 alloy case forgings in the same batch to serve as samples of the Brinell hardness of GH4169 alloy case forging bodies;
(4) at least 1 sample is taken from two ends of the GH4169 alloy case forging piece along the diameter respectively and is used as a macrostructure sample of the GH4169 alloy case forging piece; the detection surface is two radial and axial cross sections formed after cutting along the diameter of the GH4169 alloy casing forging.
In the step 1 (2), the grain size sample as the GH4169 alloy casing forging is also used as a microstructure detection sample of the GH4169 alloy casing forging.
The invention has the beneficial effects that:
1. the invention provides a testing and accepting method for controlling GH4169 alloy case forgings based on deformation degree, which changes the regulations that in the existing quality testing and accepting standards of the GH4169 alloy case forgings, the GH4169 alloy case forgings are fixed at the central position for sampling, and the span of the technical index requirement interval of grain size and Brinell hardness is large, provides more strict interval requirement and uniformity technical index for the Brinell hardness and the grain size of the GH4169 alloy case forgings, ensures the uniformity of the grain size and the Brinell hardness level of different positions of the same GH4169 alloy case forgings and the metallurgical quality stability of different GH4169 alloy case forgings in different batches, reduces the deformation degree of parts in the processing and using processes, forms a special testing and accepting method and testing index for typical GH4169 alloy case forgings aiming at strengthening the control of the deformation degree of the parts, and improves the metallurgical quality of the case forgings for aeroengines.
2. The invention provides a method and an index for checking and accepting a GH4169 alloy case forging piece based on part deformation degree control, improves the structure, mechanical property and residual stress uniformity of the GH4169 alloy case forging piece, and reduces the deformation degree of the part in the processing and using processes.
3. Through experimental research, a special acceptance index facing the GH4169 alloy case forging is formed, and after processing and application verification, the deformation degree of a corresponding GH4169 alloy case part is remarkably reduced, the flatness reaches 0.02-0.04 mm, the coaxiality reaches 0.06-0.10 mm, and the drawing and use requirements of the part are met.
Drawings
FIG. 1 is a comparison of the residual stress radar of a GH4169 alloy case forging manufactured according to the invention and the original ring acceptance criteria;
FIG. 2 is a schematic sampling diagram of different typical areas of a GH4169 alloy casing forging cut sample according to embodiment 1 of the invention;
FIG. 3 is a schematic view of a chord direction of a GH4169 alloy casing forging cutting sample;
FIG. 4 is a schematic sampling diagram of different typical areas of a GH4169 alloy casing forging cutting sample according to embodiment 2 of the invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
According to the characteristics of the GH4169 alloy casing forging, a sampling scheme is formulated according to the requirement of the structural performance uniformity control, the sampling position of the GH4169 alloy casing forging is schematically shown in FIG. 2, and the detection items of each position are shown in Table 2: the concrete description is as follows:
the method comprises the following steps: sampling
(1) Dividing the cross section of the GH4169 alloy casing forging into a small end, a middle part and a large end along the height direction as typical areas; the small end occupies 1/3 of the total height of the cross section of the GH4169 alloy casing forging, the large end occupies 1/3 of the total height of the cross section of the GH4169 alloy casing forging, the remaining part is the middle part, the small end is the end with the relatively small outer diameter, and the large end is the end with the relatively large outer diameter.
Respectively taking 2 samples in each typical region along the chord direction (shown in figure 3) of the GH4169 alloy casing forging as room-temperature tensile mechanical property samples of the GH4169 alloy casing forging;
respectively taking 2 samples along the chord direction of the GH4169 alloy casing forging in each typical area as high-temperature tensile mechanical property samples of the GH4169 alloy casing forging;
and respectively taking 2 samples along the chord direction of the GH4169 alloy casing forging in each typical area to serve as high-temperature durable mechanical property samples of the GH4169 alloy casing forging.
(2) Taking 1 sample at the position, close to the inner diameter surface, of the small end surface of the cross section of the GH4169 alloy casing forging, wherein the sample is the small end inner diameter sample; taking 1 sample at the position of the end face of the small end close to the outer diameter face as the outer diameter sample of the small end; taking 1 sample at the height of 1/4 from the small end face as a sample at the small end 1/4; taking 2 samples from the middle part as a first middle sample and a second middle sample, taking 1 sample from the position 1/4 away from the end face of the big end as a sample at the big end 1/4, and taking 1 sample from the position of the end face of the big end close to the inner diameter surface as a sample at the inner diameter of the big end; taking 1 sample at the position of the end face of the big end close to the outer diameter face as a big end outer diameter sample;
taking samples obtained twice respectively according to the sampling mode, wherein the samples obtained once are used as grain size samples of the GH4169 alloy casing forging; taking the other obtained sample as a sample with Brinell hardness at different positions of the GH4169 alloy casing forging; the detection surface is a radial axis surface of the sample.
(3) And 3 points which are uniformly distributed at intervals of 120 degrees along the circumferential direction are respectively sampled on the end face, perpendicular to the central axis, of a plurality of GH4169 alloy case forgings in the same batch to serve as samples of the Brinell hardness of the GH4169 alloy case forging body.
(4) 1 sample is taken at each of two ends of the GH4169 alloy case forging along the diameter and is used as a macrostructure sample of the GH4169 alloy case forging; the detection surface is two radial and axial cross sections formed after cutting along the diameter of the GH4169 alloy casing forging.
TABLE 2 GH4169 alloy casing forging sampling position and detection item corresponding table
Step two: detection of
And (3) judging and detecting the metallurgical quality of the GH4169 alloy case forging piece according to the following acceptance indexes of the GH4169 alloy case forging piece for the sample selected in the step one:
(1) the samples of the GH4169 alloy casing forging in different typical areas all meet the technical index requirements of tensile mechanical properties at room temperature, and the specific requirements are as follows: tensile Strength σbNot less than 1275MPa, yield strength sigma0.21035MPa or more and elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
the samples of the GH4169 alloy casing forging in different typical areas all meet the technical index requirements of high-temperature tensile mechanical properties at 650 ℃, and the specific requirements are as follows: tensile Strength σbNot less than 1000MPa, yield strength sigma0.2Not less than 860MPa, elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
the samples of the GH4169 alloy casing forging in different typical regions all meet the technical index requirements of the lasting mechanical property at the high temperature of 650 ℃ and under the loading stress of 690MPa, and the specific requirements are as follows: the duration tau of the high-temperature durable sample is more than or equal to 25h, and the elongation delta after the sample is broken is more than or equal to 5 percent;
(2) the grain size technical index requirements of different positions of the same GH4169 alloy casing forging are as follows: the average grain size is 4-9 grades, and the grain size grade difference of different positions is less than or equal to 2 grades;
(3) the technical index requirements of Brinell hardness of different positions of the same GH4169 alloy casing forging are as follows: the Brinell hardness HB = 346-450, and the difference Delta HB of the Brinell hardness at different positions is less than or equal to 28;
(4) the technical index requirements of the Brinell hardness of the body of the GH4169 alloy casing forged piece in the same batch are as follows: the Brinell hardness difference Delta HB between the GH4169 alloy casing forgings in the same batch is less than or equal to 42;
(5) the technical index requirements of the macrostructure of the GH4169 alloy casing forging are as follows: there should be no visible metallurgical defects;
(6) and the GH4169 alloy casing forging is subjected to microstructure detection according to the current professional technical standard.
TABLE 3 organization property uniformity control acceptance index of GH4169 alloy casing forged piece
According to the acceptance method and the acceptance index for controlling the GH4169 alloy case forged piece based on the deformation degree, the structural performance of the manufactured GH4169 alloy case forged piece is shown in table 4, compared with the residual stress of a forged piece manufactured according to the original ring acceptance standard (figure 1), the deformation degree of the corresponding part is shown in table 5, and it can be seen that the Brinell hardness and the grain size uniformity of the GH4169 alloy case forged piece are improved, the deformation degree of the corresponding GH4169 alloy case part is reduced, and the residual stress of the GH4169 alloy case part is also reduced.
Table 4 Structure Properties of GH4169 alloy case forgings
TABLE 5 comparison of deformation degrees of respective parts
Example 2
A method for controlling acceptance of GH4169 alloy casing forgings based on deformation degree comprises the following steps:
the method comprises the following steps: sampling
(1) Dividing the cross section of the GH4169 alloy casing forging into a small end, a middle part and a large end along the height direction as typical areas; the small end occupies 1/3 of the total height of the cross section of the GH4169 alloy casing forging, the large end occupies 1/3 of the total height of the cross section of the GH4169 alloy casing forging, the remaining part is the middle part, the small end is the end with the relatively small outer diameter, and the large end is the end with the relatively large outer diameter.
Respectively taking 3 samples in each typical region along the chord direction of the GH4169 alloy case forging as room-temperature tensile mechanical property samples of the GH4169 alloy case forging;
respectively taking 3 samples along the chord direction of the GH4169 alloy casing forging in each typical area as high-temperature tensile mechanical property samples of the GH4169 alloy casing forging;
and respectively taking 3 samples along the chord direction of the GH4169 alloy casing forging in each typical area to serve as high-temperature durable mechanical property samples of the GH4169 alloy casing forging.
(2) Taking 2 samples as small-end inner diameter samples at the positions, close to the inner diameter surface, of the small-end surface of the cross section of the GH4169 alloy casing forging; taking 2 samples at the small end face close to the outer diameter face as small end outer diameter samples; taking 1 sample at the height of 1/4 from the small end face as a sample at the small end 1/4; taking 3 samples from the middle part as middle samples, taking 1 sample at the position 1/4 away from the end face of the large end as a sample at the large end 1/4, and taking 2 samples from the end face of the large end close to the inner diameter surface as inner diameter samples of the large end; taking 2 samples at the position of the end face of the big end close to the outer diameter face as a big end outer diameter sample;
taking samples obtained twice respectively according to the sampling mode, wherein the samples obtained once are used as grain size samples of the GH4169 alloy casing forging; taking the other obtained sample as a sample with Brinell hardness at different positions of the GH4169 alloy casing forging; the detection surface is a radial axis surface of the sample.
(3) And (3) sampling 4 points uniformly distributed at intervals of 90 degrees along the circumferential direction on the end face, perpendicular to the central axis, of a plurality of GH4169 alloy case forgings in the same batch to serve as samples of Brinell hardness of GH4169 alloy case forging bodies.
(4) 2 samples are taken at two ends of the GH4169 alloy case forging piece along the diameter respectively and are used as macrostructure samples of the GH4169 alloy case forging piece; the detection surface is two radial and axial cross sections formed after cutting along the diameter of the GH4169 alloy casing forging.
TABLE 6 GH4169 alloy casing forging sampling position and detection item corresponding table
Step two: detection of
And (3) judging and detecting the metallurgical quality of the GH4169 alloy case forging piece according to the following acceptance indexes of the GH4169 alloy case forging piece for the sample selected in the step one:
(1) the samples of the GH4169 alloy casing forging in different typical areas all meet the technical index requirements of tensile mechanical properties at room temperature, and the specific requirements are as follows: tensile Strength σbNot less than 1275MPa, yield strength sigma0.21035MPa or more and elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
the samples of the GH4169 alloy casing forging in different typical areas all meet the technical index requirements of high-temperature tensile mechanical properties at 650 ℃, and the specific requirements are as follows: tensile Strength σbNot less than 1000MPa, yield strength sigma0.2Not less than 860MPa, elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
the samples of the GH4169 alloy casing forging in different typical regions all meet the technical index requirements of the lasting mechanical property at the high temperature of 650 ℃ and under the loading stress of 690MPa, and the specific requirements are as follows: the duration tau of the high-temperature durable sample is more than or equal to 25h, and the elongation delta after the sample is broken is more than or equal to 5 percent;
(2) the grain size technical index requirements of different positions of the same GH4169 alloy casing forging are as follows: the average grain size is 4-9 grades, and the grain size grade difference of different positions is less than or equal to 2 grades;
(3) the technical index requirements of Brinell hardness of different positions of the same GH4169 alloy casing forging are as follows: the Brinell hardness HB = 346-450, and the difference Delta HB of the Brinell hardness at different positions is less than or equal to 28;
(4) the technical index requirements of the Brinell hardness of the body of the GH4169 alloy casing forged piece in the same batch are as follows: the Brinell hardness difference Delta HB between the GH4169 alloy casing forgings in the same batch is less than or equal to 42;
(5) the technical index requirements of the macrostructure of the GH4169 alloy casing forging are as follows: there should be no visible metallurgical defects;
(6) and the GH4169 alloy casing forging is subjected to microstructure detection according to the current professional technical standard.
TABLE 7 organization property uniformity control acceptance index of GH4169 alloy casing forged piece
According to the acceptance method and the acceptance index for controlling the GH4169 alloy case forged piece based on the deformation degree, the structural performance of the manufactured GH4169 alloy case forged piece is shown in table 8, the deformation degree of the corresponding part is shown in table 9 compared with the residual stress of the forged piece manufactured according to the original ring acceptance standard, and the Brinell hardness and the grain size uniformity of the GH4169 alloy case forged piece are improved, the deformation degree of the corresponding GH4169 alloy case part is reduced, and the residual stress of the GH4169 alloy case part is also reduced.
Table 8 Structure Properties of GH4169 alloy case forgings
TABLE 9 comparison of deformation degrees of respective parts
Claims (10)
1. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree is characterized by comprising the following steps of controlling the acceptance index of the GH4169 alloy case forging based on the deformation degree:
(1) controlling the requirement of Brinell hardness fluctuation difference between different positions of the same GH4169 alloy casing forging and different GH4169 alloy casing forgings in the same batch;
the method specifically comprises the following steps:
1) the technical index requirements of Brinell hardness of different positions of the same GH4169 alloy casing forging are as follows: the Brinell hardness HB = 346-450, and the difference Delta HB of the Brinell hardness at different positions is less than or equal to 28;
2) the technical index requirements of the Brinell hardness of the body of the GH4169 alloy casing forged piece in the same batch are as follows: the Brinell hardness difference Delta HB between the GH4169 alloy casing forgings in the same batch is less than or equal to 42;
(2) controlling the requirements of grain size and volatility difference values of different positions of the same GH4169 alloy casing forging; the method specifically comprises the following steps:
the grain size technical index requirements of different positions of the same GH4169 alloy casing forging are as follows: the average grain size is 4-9 grades, and the grain size grade difference of different positions is less than or equal to 2 grades.
2. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree of claim 1, wherein the average grain size is grade 5-8.
3. The method for acceptance of GH4169 alloy case forgings based on deformation degree control according to claim 1 or 2, wherein the grain size grade judgment criterion is as follows: GB/T6394-2017 metal average grain size determination method.
4. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree of claim 1, further comprising the following indexes of acceptance of the GH4169 alloy case forging based on the deformation degree:
(1) the technical index requirements of tensile mechanical properties of samples of GH4169 alloy casing forgings in different typical regions at room temperature are as follows: tensile Strength σbNot less than 1275MPa, yield strength sigma0.21035MPa or more and elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
(2) the technical index requirements of the tensile mechanical property of samples of GH4169 alloy casing forgings in different typical regions at the high temperature of 650 ℃ are as follows: tensile Strength σbNot less than 1000MPa, yield strength sigma0.2Not less than 860MPa, elongation after break delta5More than or equal to 12 percent and the reduction of area psi is more than or equal to 15 percent;
(3) the technical index requirements of the endurance mechanical properties of samples of the GH4169 alloy casing forging in different typical regions at the high temperature of 650 ℃ and under the loading stress of 690MPa are as follows: the duration tau of the high-temperature durable sample is more than or equal to 25h, and the elongation delta after fracture is more than or equal to 5%.
5. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree according to claim 1 or 4, further comprising the following indexes of acceptance of the GH4169 alloy case forging based on the deformation degree:
the technical index requirements of the macrostructure of the GH4169 alloy casing forging are as follows: there were no visible metallurgical defects.
6. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree of claim 5, wherein the visual metallurgical defects comprise one or more of looseness, pinholes, cracks, shrinkage cavities, segregation, slag inclusion and inclusions.
7. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree of claim 5, further comprising the following indexes of acceptance of the GH4169 alloy case forging based on the deformation degree:
and the GH4169 alloy casing forging is subjected to microstructure detection according to the current professional technical standard.
8. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree according to any one of claims 1-2, 4 and 6-7, wherein the method comprises the following steps:
step 1: tissue property sampling scheme
According to the shape characteristics of the GH4169 alloy case forging, cutting GH4169 alloy case forging samples at different typical areas for structure performance detection, and ensuring that the requirements of uniformity evaluation and detection sampling are met;
step 2: acceptance index of tissue performance
And controlling the acceptance index of the GH4169 alloy casing forging to accept based on the deformation degree, wherein each detection sample is required to meet the requirement of the acceptance index.
9. The method for checking and accepting the GH4169 alloy case forging based on the deformation degree control as claimed in claim 8, wherein in the step 1, a specific sampling mode is as follows:
(1) dividing the cross section of the GH4169 alloy casing forging into a small end, a middle part and a large end along the height direction as typical areas; at least 2 samples are respectively taken in each typical region along the chord direction of the GH4169 alloy case forging piece and are used as room-temperature tensile mechanical property samples of the GH4169 alloy case forging piece;
at least 2 samples are respectively taken along the chord direction of the GH4169 alloy casing forge piece in each typical area to serve as high-temperature tensile mechanical property samples of the GH4169 alloy casing forge piece;
at least 2 samples are respectively taken along the chord direction of the GH4169 alloy casing forge piece in each typical area to serve as high-temperature durable mechanical property samples of the GH4169 alloy casing forge piece;
(2) taking at least 1 sample at the position, close to the inner diameter surface, of the small end surface of the cross section of the GH4169 alloy casing forging, wherein the sample is the small end inner diameter sample; taking at least 1 sample at the position of the small end face close to the outer diameter face as a small end outer diameter sample; taking at least 1 sample at the height of 1/4 from the small end face as a sample at the small end 1/4; taking at least 2 samples from the middle part as middle samples; taking at least 1 sample at the height 1/4 from the end face of the big end as a sample at the big end 1/4, and taking at least 1 sample at the position of the end face of the big end close to the inner diameter surface as a sample at the inner diameter of the big end; taking at least 1 sample at the position of the end face of the big end close to the outer diameter face as a big end outer diameter sample;
taking samples obtained twice respectively according to the sampling mode, wherein the samples obtained once are used as grain size samples of the GH4169 alloy casing forging; taking the other obtained sample as a sample with Brinell hardness at different positions of the GH4169 alloy casing forging; the detection surface is a radial shaft surface of the sample;
(3) at least 3 points which are uniformly distributed at intervals along the circumferential direction are respectively sampled on the end face, perpendicular to the middle shaft, of a plurality of GH4169 alloy case forgings in the same batch to serve as samples of the Brinell hardness of GH4169 alloy case forging bodies;
(4) at least 1 sample is taken from two ends of the GH4169 alloy case forging piece along the diameter respectively and is used as a macrostructure sample of the GH4169 alloy case forging piece; the detection surface is two radial and axial cross sections formed after cutting along the diameter of the GH4169 alloy casing forging.
10. The method for controlling the acceptance of the GH4169 alloy case forging based on the deformation degree of claim 9, wherein the grain size sample as the GH4169 alloy case forging is also used as the microstructure detection sample of the GH4169 alloy case forging.
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